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APPLICATION EXAMPLE 4: MUTING ON A HYDRAULIC PRESS WITH 1 MUTABLE SAFETY DEVICE AND 4 AUXILIARY
MUTING SENSORS
EM2
EM2
EM1
EM1
1
SM1
SM1
2
SM2
SM2
closing stroke
BDC
Protection
Muting starting
(SM1 activated)
(SM1& SM2 activated)
Application description
On a hydraulic press, the safety device (e.g. safety light curtain) can be muted as soon as the press tool reaches the bottom
dead centre (BDC), allowing the operator to unload and load the press during the opening stroke without stopping the
movement of the press.
The muting system is composed of the following elements:
• the FF-SRM200P2 muting module,
• 1 mutable safety device (e.g. a FF-SYA safety light curtain)
• 2 start muting sensors and 2 end muting sensors (e.g. safety switches).
INCORRECT USE OF MUTING
• Ensure that muting is only allowed during the opening stroke of the press (this is especially valid for presses running in
reverse mode).
• Never allow muting during the closing stroke.
INCORRECT MUTING SENSOR INSTALLATION
• Install the second muting sensor SM2 in such way so that it is activated by the translating cam at a position of minimum 6 mm
above the BDC (in Europe) or ¼ inch above the BDC (in North America). Muting sensor SM1 must have been activated max.
10 s before SM2, in order to have a valid muting sequence.
• Install the second muting sensor EM2 in such way so that it gets de-activated as soon as the press tool starts its closing
stroke. The first EM muting sensor getting de-activated stops the muting sequence. Both EM muting sensors must be de-
activated to allow the next muting sequence, and the activation of the safety device stops the hazard.
• It is NOT allowed to mute the safety device during the closing stroke of the press.
Failure to comply with this instruction could result in death or serious injury.
Wiring diagram
(dc+)
1 A
0,5 A
max.
max.
1
3
(A)
Light
FF-SYA
(B)
curtain
2 6
4
5
A1+
S11 S12 S14 S13
-
+ +
-
A2-
M1 M2 48
muting /
error restart
(dc-)
16
EM2
EM2
EM1
EM1
4
3
SM1
SM1
SM2
SM2
opening stroke
opening stroke
Muting in progress
Muting active
(SM2 released)
EM1
EM2
SM1
(C)
(C)
S21
S22
S24
S23
S31
S32
S34
-
+
+
-
-
+
+
K1
K2
13
23 33
34
machine
control
K3
K4
(D)
(D)
EM2
5
EM1
6
SM1
SM2
TDC
closing stroke
Muting active
Muting interrupted /
Protection
(EM1&EM2 activated)
(EM2 released)
Note (A): Signals between redundant safety
Note (B): Modes 70 to 79: muting using
Start
Note (C): Sensors contact type: safety switch
K3
SM2
(D)
K4
(C)
S33
S41 S42 S44 S43
Note (D): External contactors: when external
-
-
+ +
-
24
14
58
relay status
(B)
SM1 Start muting sensor 1
SM2 Start muting sensor 2
EM2
EM1 End muting sensor 1
EM2 End muting sensor 2
EM1
SM1
BDC (Bottom Dead
SM2
Center): point at which the
tool is closest to the die.
TDC (Top Dead Center):
point at which the tool is
furthest to the die.
device inputs S11 to S14 must be
applied within a max. time of 2,5 s.
safety devices with test input:
terminal 58 is used as test output that
must be connected to the test input of
the safety device (refer to chapter
"Test input").
contacts are preferred for press
applications.
contactors are used, connect one
normally closed contact of each
contactor (or the normally closed
contact of the FF-SRE extension
module) in series into the combined
restart loop and External Device
Monitoring
(EDM)
Install arc suppressors across the
coils of external safety relays.
107111-11-EN FR26 GLO 503 Printed in Germany
loop
S43/S44.
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